Easy to Remember - SAP Transaction Codes

SPRO    DEFINE ITEM CATEGORY    
MM01    CREATE MATERIAL 
MM02    MODIFY MATERIAL 
MM03    DISPLAY MATERIAL        
MMS1    CREATE MATERIAL MASTER  
MMS2    CHANGE MATERIAL MASTER  
MMS3    DISPLAY MATERIAL MASTER 
MB1C    MAINTAIN STOCK  
MMPI    INITIALISE PERIOD FOR MASTER MATERIAL RECORDFROM CO CODE        
MMBE    CREATE STOCK    
MM60    MATERIAL LIST   
XD01    CREATE CUSTOMER 
XD02    MODIFY CUSTOMER 
XD03    DISPLAY CUSTOMER        
VA01    CREATE ORDER    
VA02    CHANGE ORDER    
VA03    DISPLAY ORDER   
VA11    CREATE INQUIRY  
VA12    CHANGE INQUIRY  
VA13    DISPLAY INQUIRY 
VA21    CREATE QUOTATION        
VA22    CHANGE QUOTATION        
VA23    DISPLAY QUOTATION       
VD02    CHANGE  SALES PROSPECT  
VD03    DISPLAY SALES PROSPECT  
VD04    DISPLAY CHANGES 
VD06    FLAG FOR DELETION       
VK11    MAINTAINING PRICING     
VK0A    ASSIGN G/L ACCOUNT GENERAL      
VOK0    PRICING 
VOR1    DEF COMMON DIST CHANEL  
VOR2    DEF COMMON DIV  
VOV6    DEFINE SCHEDULE LINES   
VOV8    DEFINE SALES DOC TYPE   
VOFA    CREATE/OR CHANGE BILLING TYPES CONFIGURATION    
V129    DEFINE INCOMPLETENESS SCHEMAS FOR FOREIGN TRADE 
V149    ASSIGN INCOMPLETENESS SCHEMAS FOR COUNTRY CODE  
CA01    CREATE ROUTING  
CA02    EDIT  ROUTING   
CA03    DISPLAY ROUTING 
CS01    CREATE BOM      
CS02    CHANGE BOM      
CS03    DISPLAY BOM     
OVK1    DEFINE TAX DET RULES    
OVK3    DEF TAX REL OF MASTER RECORDS CUSTOMER TAXES    
OVK4    DEF TAX REL OF MASTER RECORDS MATERIAL TAXES    
OVR6    DEF LEGAL STATUSES      
OVS9    DEF CUSTOMER GRP        
OVRA    MAINT STATISTICS GRPS FOR CUSTOMERS     
OVRF    MAINT STATISTICS GRPS FOR MATERIAL      
OVXC    ASSIGN SHIIPING POINT TO PLANT  
OVX6    ASSIGN PLANT TO S.O AND DIST CHANEL     
OVLK    DEFINE DELIVERY TYPE    
OVSG    DEFINE INCOTERMS        
OVLH    DEFINE ROUTES   
OVXM    ASSIGN SALES OFF TO SALES AREA  
OVXJ    ASSIGN SALES GRP TO SALES OFFICE        
OMS2    MATERAIL UPDATE 
OVLP    DEFINE ITEM CATEGORY FOR DELIVERY       
OX10    ASSIGN DEL PLANTS FOR TAX DET   
O/S2    DEFINE SERIAL NO PROFILE        
O/S1    DEFINE CENTRAL CONTROL PARAMETERS FOR SR NO     
OBB8    DEFINE TERMS OF PAYMENT 
OKKP    ACTIVATION OF COMPONENETS       
VB01    CREATE REBATE AGGREMENTS        
VB02    CHANGE REBATE AGREMENT  
VB03    DISPLAY REBATE AGGREMENT        
VB31    CREATE PROMOTION        
VB32    CHANGE PROMOTION        
VB33    DISPLAY PROMOTION       
VB21    CREATE SALES DEAL       
VB22    CHANGE SALES DEAL       
VB23    DISPLAY SALES DEAL      
VB25    LIST OF SALES DEAL      
VB35    PROMOTION LIST  
VKA4    CREATE ARCHIVE ADMINISTRATION   
VKA5    DEL ARCHIVE ADMINISTRATION      
VKA6    RELOAD ARCHIVE ADMINISTRATION   
VC/1    CUSTOMER LIST   
VC/2    CREATE SALES SUMMARY    
VDH2    DISPLAY CUSTOMER HIERARCHY      
VF01    CREATE PROFORMA INVOICE 
VF02    CHANGE PROFORMAINVOICE  
VF03    DISPLAYPROFORMA  INVOICE        
VF07    DISPLAY FROM ARCHIVE    
VF11    CANCEL BILL     
VFX3    BLOCKED BILLING DOC     
VFRB    RETRO BILLING   
VF04    MAINTAIN BILL DUE LIST  
VF06    BACKGROUND PROCESSING   
VF21    CREATE INVOICE LIST     
VF22    CHANGE INVOICE LIST     
VF23    DISPLAY INVOICE LIST    
VF44    MAINT  REVENUE LIST     
VF45    REVENUE REPORTS 
VF46    MAINT CANCELLATION LIST 
VF31    ISSUE BILLING DOC       
VFP1    SET BILLING DATE        
VARR    ARCHIVE DOCUMENTS       
VL01N   CREATE DELIVERY         
VL02N   TO CHANGE DELIVERY WHICH IS ALREADY CREATED     
VL03N   DISPLAY DELIVERY                  
V/08    TO CHANGE CONDITION (PR PROCEDURE)      
V/30    DEFINE PRINT PARAMETERS 
FD32    SETTING CREDIT LIMIT FOR CUSTOMER       
/NSM12  TO REMOVE LOCK ENTRY    
SM30            
ND59    LIST CUSTOMER MATERIAL INFO     
VB0F    UPDATE BILL DOC

These are alternate Tcodes which are not 
listed in SAP front end 4.7 enterprise edition either. Some examples are: 

OY05 is also SCAL. 
S_AHR_61016362 - PAR1- SAP Standard flexible report is also PAR1
S_AHR_61016369 - Employee List - PAR2.